The Healthy China strategy has promoted primary health services to shift from disease treatment to full life cycle health management. The integration of medical and prevention has become an effective way for primary hospitals to focus on prevention. This article uses the methods of policy analysis, process review, and practical induction to study the connection mechanism between diagnosis and treatment business and basic public health services. After research, it was found that there are problems such as process separation, insufficient information utilization, lack of personnel comprehensive capabilities, and weak performance synergy in the integration of grassroots medical and prevention. Therefore, a closed-loop path is formed that connects risk identification and clinical diagnosis and treatment, extending to follow-up management, and incorporates referral collaboration and quality evaluation. The study believes that grassroots hospitals should take residents’ health outcomes as the common goal, use the family doctor team as the carrier, and use information collaboration and performance linkage as the support to make medical services and preventive services continue.